Assickbtor to landis machine



D. MILLER.

DIE HEAD.

APPLICATION HLED JULY 22. mm.

1,296,546. Patented Mar. 4,1919.

3 SHEETSSHEET I V l amucnfoz /5 DamielJMiHr. 65

WrW,

('1 Hon Imam .D. J. MILLER.

DIE HEAD.

APPLICATION FILED JuLv 22.1918.

Patented Mgr. 4,1919.

3 SHEETS-SHEET 2 I'Tg 47 g c wuembo z DamieIJ. Miller D. J. MILLER.

DIE HEAD.

APPLICATION mm mu 22.1918.

1,296,546. Patented Mar. 4,1919.

3 SHEETS-SHEET 3- UNITED STATES PATENT OFFICE.

DANIEL J. MILLER, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR '10 LAN DIS MACHINE COMPANY.

DIEFHEAD.

Specification of Letters Patent.

Patented lilar. 4, 1919.

To all whom it may concern:

Be it known that I, DANIEL J. MILLER, a citizen of the United States, residing at VVaynesboro, Franklin county, and State of Pennsylvania, have invented and discovered certain new and useful Improvements in Die-Heads, of which the following is a speci fication.

My said invention consists in certain improvements in the construction and arrangement of parts of cutter-heads for cutting threads on bolts, etc., of the type wherein the cutters or chasers are arranged tan gentially to the work, said improvements resulting in various advantages in the construction and operation, all as will be hereinafter more fully pointed out and claimed.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a front elevation or face view of a cutter-head, certain portions being shown in section to illustrate the construction more clearly;

Fig. 2, a perspective view showing the end or face of an operating handle;

Fig. 3, a view partly in edge elevation and partly in longitudinal section of one of said heads;

Fig. 4, a detail section on the dotted line 4 4 in Fig. 1;

Fig. 5, a detail plan View,

Fig. 6, a face view with the cutter-holders removed, and

Fig. 7, a perspective view of the outer end of the handle showing the latch-knob withdrawn.

In said drawings the portions marked A represent the body or frame of the head, B the cutter-holders, and C the cutters.

The frame or body A comprises a casting of appropriate size and having appropriate bores, recesses and bearings by which the various parts may be mounted thereon or attached thereto. It is formed with a central perforation through which the work may pass and has a rearwardly projecting flange or extension (1 which extends into shank 10 by which the head is mounted on the turret of the machine.

A series of bearings are formed equal distances apart around the central aperture in the body A in which are mounted trunnions 11 to the outer ends of which the cutterholders B are secured. Said trunnions are shouldered at their outer ends and have central screw-threaded perforations in both ends. A screw 41 with a large head 42 is mounted in the rear end of the bearing and engages with the screw-threaded perforations in the rear end of the trunnion, its inner face being adapted to bear against the face of an annular flange 40 formed in the bearing at a point which will be adjacent to the rear end of the trunnion. Set screws 43 are adapted to project through the head 42 of screw 41 to bear against the rear end of the trunnion and limit the inward movement of the screw 41. The cutter-holders B are mounted on the shouldered front ends of said trunnions, having recesses formed to receive said shouldered ends, and are secured thereon by means of screws 45, which en age in screw-threaded perforations in the ront'ends of the trunnions, and by dowel pins 44 mounted in the front end of the trunnion and engaging with a socket in the face of the cutter-holder, thus preventing said cutter-holder from having independent rotary movement on said trunnion. By adjusting the screw 43 the trunnions may be drawn back into the bearings so as to insure a firm support for the cutter-holders B against the face of the body and ring 15, the proper adjustment being fixed by the said screws 43, and any wear between the parts being taken up by adjusting said screws, which also serve to prevent any backward turning of the screw 41.

Said cutter-holders B are of a form best illustrated in Fig. 1, being formed with cutter supports in which the tangential cutters 6 are mounted, after the general construetion common to the Landis cutter head. The outer ends of said cutter-holders opposite the trunnion 11 are formed slotted and sliding blocks 13 are mounted in said slots and connected by pivots 14 with a ring 15 mounted to rock on body A. Said rin 15 is provided with a handle 76 by WlllCl'l it is rocked to open and close the die as will be presently described.

A ring 16 is mounted on body A between ring 15 and the flange 17 on the head of shank 10. Said flange 17 constitutes a ringcasing or ring-frame and fits over the rear end of body A and said. ring 16 has a flange 18 on it rear outside edge which fits into a corresponding recess in the corner of said flange or ring-casin 17. A shoulder is formed in the body at oint 19 against which the rear face of sai ring 16 abuts. Said ring 16 has a tangential erforation which cuts through its inner sur ace and an adjusting screw 20 i mounted therein, being held from movement in one direction by the bottom of the perforation and in the other direction b a screw-threaded collar 21 inserted outsi e of its head after it has been put in place. Said screw meshes with a. worm or s iral thread 22 formed on the surface of t e body A adjacent to said rin 16.

y this means, as will be readily seen, the turning of screw 16 operates to turn body A and carry with it the cutter-holders, which by reason of their connection with pivots 14 and blocks 13 turn on their trunnions 11 and thus throw the points of the cutters in or out as desired to fix the size of the cuttin' die.

audio 76 is fixed to ring 15 by screws 46 and is longitudinally perforated, the outer end of the perforation being larger than the inner end forming a shoulder mldway thereof. A reversible latch pin 23 is mounted therein and is held inward by a spring 24 interposed between a collar 25 on said latch pin and a collar 26 secured near the outer end of the handle in an enlarged portion of the socket. Collar 25 rests on the shoulder midway the perforation in the handle when it is in normal osition. A latch knob 27 is mounted on said latch pin by means of a pin 28. It has projections 47 adapted to engage recesses onopposite sides of collar 26 to secure it in whichever sition desired. The' inner end of said atch 23 is formed as best shown in Fig. 1, with one side a little farther from the center than the other, and is adapted to engage with notches or recesses in opposite sides of the inner end of the latch-pin 29. Said latch-pin is mounted in and extends through perforations in the flange 17 and ring 16, and thus locking the rings 15 and 16 and flan 17 from independent rotation and hol s them together when said latch is engaged. f The rings are secured on body A b a retaining ring 30 set into a recess ormed partly in the body and partly in ring 15 as shown. Said ring 30 is secured in position by screws 31 and the parts are thus locked to ether on the body.

ody A is provided with longitudinal apertures 50 situated midway between the trunnions on which the cutterholders are mounted. In each of said apertures is mounted a spring 51, preferably of a helical type, and having two arms 52 and 53 exmounted are inch from t appropriate stop on the turret, or other tending from the coiled portion. The end of arm 53 projects through the aperture and engages with a erforation, as at 54 (Fig. 1) in each cutter-holder. These springs are under heavy tension and normally tend to turn the cutter-holders on their trunnions to open the die.

The head 17 of the shank 10 is secured to adjusting ring 16 by bolts 60 which have screw-threaded ends seated in screw-threaded perforations in ring 16 and pass through larger perforations or sockets 1n the flange of head 17. Springs 61 are interposed. between the heads of the bolts and an annular flange 77 at the bottom of said sockets. The head of each bolt 60 is adapted to have a limited movement within the perforation in which it is mounted as at point 62 shown most clearly in Fig. 1 and for a purpose to be presently described.

Indicator 'marks are stamped on opposite sides of the up er end of handle 76, RH on one side, and LH on the opposite side. .On opposite sides of the latch head 27 are stamped indicator marks R and F0 respectively.

On one side of the head of latch-pin 29 (see Fig. 5) is stamped an indicator mark 0 land on opposite sides of the aperture in flange 17 in which said pin is stamped indicator marks ORH on one side, and LI-IO on the other side.

In the operation pf the cutter-head the die is first set to cut the size of work desired by adjusting the screw 20. This is done by inserting a screw driver'into the tangential perforation 12 in ring 16 which operates to turn the body within the rings 15 and 16 and head 17. Said head 17 being fast on the turret of the machine and the ring 16 secured rigidly to said head by the latch-pin 29, and a pm 65 on the opposite of the head extending through head 17, and ring 16, the turning of the body changes trunnions 11 and gives the various diameters within the limit of the head.

The die is locked in closed positionby the latch 23 engaging that one of the recesses in the appropriate side of the latch-pin 29. The parts being thus set, the operation of cuttlng the thread proceeds until it has reached approximately one-eighth of an e finish when by reason of an means for retarding the forward movement of the carria e, the work will no longer feed but will raw the die toward the work, separating the ring 16 from head 17 by the distance allowed by the shoulder at oint 62 under the heads of bolts 60. The rawing of the rings 15 and 16 toward the work operates to raise latch 23 which rises up out of the notch in latch pin 29 by reason of the tapered or curved edge, as indicated inost clearly by dotted lines in Fig. 3, until it rests upon the surface of said pin 29 when the springs 51 operate to turn the cutterholders on their trunnions 11 and at the same time rock ring 15 through the distance allowed by slot 66 (see Fig. 1). As soon as the die is open springs 61operate to close parts 16 and 17, or to bring themtogether m the position shown in Fig. 4, where the die is again ready to be setby handle 76. In the meantime the die has been thus automatically opened so as to free the cutters from the thread in the work and to permit the work to be withdrawn and a new blank inserted ready for another operation. In the event the head is to be operated for fine work, where a roughing cut is first desired and then a finishing cut latch 23 is set by turning until the letter It on the head 2 is brought to register .with the letters RH on the handle 76. This engages'the latch on its side to give the die a slightly opened position during which the roughing cut is made. After the die has been opened and the work withdrawn latch 27 is reversed by bringing the letters F0 on the head 27 to register with the letters RH on handle 16 and the die locked, when the finishing cut is made.

When it is desired to do left hand work, or cut left hand threads, the right hand cutter hold rs B areremoved and a set of 7 left hand cutter-holders substituted in the usual way. Screw 67 which holds latch-pin 29 is removed and said latch-pin given a half revolution to bring notch 68 shown in Fig. 1 on the lower side into position to engage the latch. Screw 67 is then inserted in the other tapered end of perforation 88. Said notch 68 will then be m the reversed position and the latch becomeoperative to lock the die for left hand cutting.' Therespective positions of the latch" pin are de-- termined, or indicated, by bringm the letter 0, stamped on the head of latch in 29, to register with the letters OR stamped adjacent to one side thereof on the head 17, when righthand cuttin is to be done; and by bringing the said etter .0 on the head 29 to reglster with the letters LHO adjacent to the opposite side, when left hand cutting is to be done.

By this arrangement a very rigidconstruction is provided and one that is capable of various adjustments for different sizes and character of work in an expeditious and convenient manner.

In Fig. 6 are shown indicator marks for determining the size of the work to be secured by the operation of the adjusting screw 20. On the face of the retaining ring 30 are formed a series of indicator marks adapted to register with a series of indicator marks on the adjacent face of ring 15. These marks are so arranged asto deter 1. A cutter-head comprising a shank for mounting on the turret of the machine and having an outer ring-casing rigid therewith, a body or frame mounted'to turn within said outer ring-casing, trunnions mounted to turn in said body, cutter-holders mounted to turn said trunnions, means for adjusting said cutter-holders to determine the size of the die by-turning the body within said outer ring-casing, and means for openin and closing the die, substantially as set orth.

2. A cutter-head comprising an outer casing or ring with a shank for securingKthe same on the turret of the machine,.a dy mounted to turn within said ring, means for turning said bod within said ring and holding it in adjuste position, trunnions mounted in said body, cutter-holders mounted on said trunnions, cutters on said cutter-holders, and a rin adapted to turn on said body wherebythe ie is opened and closed, substartially as set forth.

3. A cutter-head comprising a shank for attachment to the turret of the machine having a ring rigid therewith, a body mounted to turn in said ring, another ring mounted alongside said first rin and held from rotation but adapted to sllde toward and from said first ring, means interposed between said second ring and the body for adjusting and locking said parts in des red circumferential adjustment, another rin mounted on said body alongside said secon ring and adapted to have a limited independent rotary motidn on said body a locking device for securing said ring 1n fixed position, trunnions mounted n said body, cutter-holders mounted on said -trunmons, a pivotal and sliding'connection between said cutter-holders and said rocking ring, and means for turnin said ri on said body to open and close t e die, substantially as set forth. 4 A cutter-head comprising a shank for mounting on the turret of the machine and having an outer ring-frame therewith, the body mounted to turn in said ring-frame a second ring mounted to move toward an from said ring-frame but held against independent turning, a third ring mounted to have a limited independent turning movement, means for retaining said rings on the normally holding the die open, a sliding and pivotal connection between the outer ends of said cutter-holders and said third ring, and

means for operating said third ring to open and close the die, substantially as set forth.

5. A cutter-head comprising a shank for mounting the same on the machine turret and formed with an outer ring-frame, a body mounted to turn within said rin frame, a second ring mounted on said he y adjacent to said ring-frame and held from independent turnin movement but mounted to have 1 short sliding movement toward and from said ring frame, a tangential screw mounted in said second rin Egng threads in the adjacent si e of said whereby said body may be turned to secure difierent circumferentially ad'ustments and held in any adjustment desire another ring mounted alon ide said second ring' to have a limited in ependent turning movement a handle on said ring, a latch in said handle, a latch-pin carried b said ringframe and having a notch wit which said latch is adapted to engage, trunnions mounted in said ody, cutter-holders mounted to rock on said trunnions, springs for normally holding said cutter-holders to open the die a connection between said cutter-holders an said last mentioned ring, the engagement between the latch and etch-pin being such that when the body is drawn awa from the ring-frame slightly the latch wi ride out of the notch in said latch-pin and allow the die to open automatically under the expansion of said springs, means for returning the and enparts to closed position, and means for separating the parts near the finish of the work, substantially as set forth.

6. A cutter-head comprising a shank with an outer ring-frame rigiditherewith, a body mounted to turn in said ring-frame, means for adjusting said body in circumferential relation to said ring-frame and holdin it in adjusted position, trunnions moun in said body, cutter-holders mounted on said trunnions, cutters on said cutter-holders, and means for turning said body to open and close the die formed by said cutters, substantially as set forth.

7. A cutter-head comprising a shank for mounting on the machine turret and having a rin -frame, a body mounted to turn in said ringrame, means for adjusting and holding said body, trunnions carried b said body,-cutter-holders mounted on sai turnnions, means for opening and closing the die, means whereby one set of cutters may be removed and another set substituted therefor, and means for securing said parts in position to operate either for cutting righthand or left-hand threads, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at Waynesboro, Pennsylvania, this 17th day of July, A. D; nineteen hundred and eighteen.

DANIEL J. MILLER.

Witnesses:

JOHN H. Emo'rr, J. G. BENEDICT. 

